On radiation of sound from open end of an irregular wedge‐shaped waveguide

The characteristics of sound field radiated from the open end of a wedge‐shaped waveguide are studied. A characteristic feature of the waveguide geometry is that the edges of nonparallel half‐planes are arranged on different distances from the wedge apex. The additional elongation of the wall is considered as a screen and is an important element in the mechanism of control of the near‐ and far‐field characteristics. To solve the corresponding boundary problem an analytical method has been developed. The central idea of the analytical method and the possibility of one to solve other boundary problems are discussed. The radiated sound field is produced by an incident mode in waveguide. Qualitative data about space structure and energy characteristic of the radiated field are presented. The data about change of the sound pattern when the parameters of the waveguide are changed illustrate the complex structure of the radiated sound field and strong dependence of one on the structure of a normal wave carrying the energy to the edge of the waveguide. Qualitative description of the far‐field structure is complemented by data about the concentration factor of sound energy and distribution of energy between transmitted and reflected waves.